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Work Plan For A Limited Subsurface Investigation - Chevron Service Station #9-3232 <br /> October 2, 1998 <br /> f <br /> Task 1 . Pre-field Activities <br /> GR will prepare a site specific health and safety plan and obtain the necessary <br /> monitoring well installation permits from the SJCPHS . Underground Service Alert <br /> (USA) will be notified a minimum of 48 hours in advance of the scheduled work. A <br /> private line locator will be contracted to locate on-site subsurface utilities . <br /> Task 2. Well Installation and Soil Borings <br /> GR will install four groundwater monitoring wells at the locations shown on Figure 2 . <br /> Drilling and well construction will be performed by Bay Area Exploration, Inc . (C57 <br /> #522125) . A GR geologist will monitor the drilling activities and prepare a log of <br /> each boring. Well borings will be drilled with 8-inch diameter hollow-stem augers <br /> to approximately 55 feet bgs . Soil samples for description and possible chemical <br /> analysis will be obtained from each boring at five-foot intervals , as a minimum. <br /> Sample handling procedures are described in Appendix A. Although the actual <br /> number of samples submitted for chemical analysis will depend on site conditions and <br /> field screening data , we anticipate a minimum of two soil samples collected from <br /> above groundwater in each boring will be submitted for chemical analysis as described <br /> in Task 5 . <br /> Soil from each sampled interval will be screened in the field for the presence of <br /> volatile organic compounds using a photoionization detector (PID) . These data will <br /> be collected for reconnaissance purposes only , and will not be used as verification of <br /> the presence or absence of petroleum hydrocarbons . Screening data will be recorded <br /> on the boring logs . <br /> Groundwater monitoring wells will be constructed with 2-inch diameter Schedule 40 <br /> polyvinyl chloride (PVC) well casing and 0 . 02-inch machine slotted well screen, as <br /> shown on the Proposed Well Construction Detail (Figure 3) . The wells will be <br /> constructed with 5 feet of screen above and 15 feet of screen below groundwater <br /> (approximately 35 to 55 feet bgs) . Actual screen intervals will depend on the <br /> groundwater depth and lithologic conditions encountered during drilling. <br /> Drill cuttings will be stored at the site pending receipt of chemical analytical data for <br /> disposal . The drill cuttings will be stockpiled on and covered with plastic sheeting . <br /> Soil samples from the drill cuttings will be collected for disposal characterization as <br /> described in Task 5 . GR will arrange for Chevron' s contractor Integrated <br /> wastestream management (IWM) to properly dispose of the drill cuttings . Steam <br /> 346463.01-1 3 <br /> I <br />